Summary
A number of hybrids between.Digitalis purpurea ♀ andD. ambigua ♂ were obtained. Two plants among the hybrids showed a low degree of fertility. From the others no seeds were obtained.
TheF 2 generation differed from theF 1 principally in size, but there was no segregation of the parental characters. About 75 per cent. were highly fertile.
The chromosome numbers of the parent species and of theF 1 hybrid are 28 (n) and 56 (2n) in each case. In theF 2 hybrid (artificial pollination) the numbers are 56–112, while all plants obtained from open pollination of theF 1 are triploid (84-2n) and sterile.
The viable spores of theF 1 result from the failure of the reduction division and the formation of restitution nuclei.
Digitalis purpurea ×ambigua is an additional example of a constant intermediate hybrid resulting from chromosome doubling.
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Buxton, B.H., Newton, W.C.F. Hybrids ofDigitalis ambigua andDigitalis purpurea, their fertility and cytology. Journ. of Gen. 19, 269–279 (1928). https://doi.org/10.1007/BF02983159
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DOI: https://doi.org/10.1007/BF02983159